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crypto: af_alg/hash: Support MSG_SPLICE_PAGES

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Make AF_ALG sendmsg() support MSG_SPLICE_PAGES in the hashing code.  This
causes pages to be spliced from the source iterator if possible.

This allows ->sendpage() to be replaced by something that can handle
multiple multipage folios in a single transaction.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Herbert Xu <herbert@gondor.apana.org.au>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: Jens Axboe <axboe@kernel.dk>
cc: Matthew Wilcox <willy@infradead.org>
cc: linux-crypto@vger.kernel.org
cc: netdev@vger.kernel.org
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
David Howells
2023-06-06 14:08:56 +01:00
committed by Paolo Abeni
parent fb800fa4c1
commit c662b043cd
2 changed files with 73 additions and 44 deletions
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11
crypto/af_alg.c
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@@ -542,9 +542,14 @@ void af_alg_free_sg(struct af_alg_sgl *sgl)
{
int i;
if (sgl->need_unpin)
for (i = 0; i < sgl->sgt.nents; i++)
unpin_user_page(sg_page(&sgl->sgt.sgl[i]));
if (sgl->sgt.sgl) {
if (sgl->need_unpin)
for (i = 0; i < sgl->sgt.nents; i++)
unpin_user_page(sg_page(&sgl->sgt.sgl[i]));
if (sgl->sgt.sgl != sgl->sgl)
kvfree(sgl->sgt.sgl);
sgl->sgt.sgl = NULL;
}
}
EXPORT_SYMBOL_GPL(af_alg_free_sg);